1. BPM and Profile Monitor Alignment Debbie Harris in consultation with Wes Smart Peter Prieto Virgil Bocean

2. NuMI Beamline Convention A Device should report the signed distance of the actual beam with respect to the ideal beam. For NUMI: Beam left: positive x (as you look downstream) For NUMI: Beam Up: positive y Note: This is not a universal convention!!!

3. Profile Monitor Alignment Correction needed: to get from center of foil plane (half-way between the middle two files, defined as monitor center) to the ideal beam position: Profile Monitors in MI area (PM101-PM112) haven’t moved since December Others may have moved… February Alignment constants: ADD these numbers to position relative to monitor center to get position w/rt ideal beam position PM NAMESerial Number Horizontal offset [mm] Vertical offset [mm] PM101TX90.057-0.038 PM105TX110.057-0.057 PM107TX0-0.0510.133 PM108TX60.0760.108 PM112TX8-0.0130.114 PM114TX2-0.1660.252 PM115TX3-0.135-0.150 PM117TX4-0.091-0.183 MW118MW60.0000.025 PM121TX10-0.2120.051 PMTGTTX70.150-0.023

4. BPM Alignment Remember how BPM works: beam goes through BPM, induces charge on two plates

5. Electric Center Measurement Electric center: location where when particle goes through, charge induced on two plates are equal Measured by Jim Fitzpatrick on test stand—4 orientations, take the sum This offset is measured relative to physical center as defined by alignment holes So imagine to induce equal charge, beam is 1mm in positive direction: want that to be zero! Have to subtract this offset but they are usually very small… usually <.1mm, 5 are.1-.3mm

6. Physical Offset w/rt Ideal Beam: BPM’s have 4 alignment holes, know electric cener w/rt center defined by these holes SAG aligns cylinders of BPM’s relative to ideal beam position SAG measures in beamine positions of cylinders w/rt Ideal Beam SAG measures (in village) center w/rt cylinder If beam goes through center w/rt holes of BPM, want it to tell you how far that center is from ideal beam: ADD this correction! (same as PM’s)

7. Electronic Offset Forget the BPM: what happens if you put equal charge into the cables that go the electronics, what position does electronics read back? This can be due to phase differences, cable lengths, etc. You want electronics to return 0mm if it gets equal charge as input: subtract what you measure when you put in equal charge! These can be large (up to 1.5mm!) BPM Name Electronic Offset [mm] VP101-1.210 HP1010.290 HP1020.330 VP103-0.310 HP1040.290 HP105-1.520 VP106-0.550 HP1070.610 VP108-0.370 HP1090.080 VP110-0.370 VP1110.470 HP1120.560 VP1131.018 HP1140.485 HP1150.513 VP1160.610 HP1171.045 VP1180.288 HP1190.592 HP121-0.162 VP121-0.010 HPTGT0.571 VPTGT0.120

8. What offsets were on when? In December and January, electronic offsets were in, but not the others. The others (summarized in table at right) are to be added BUT only MI area ones are sure to be exactly correct… BPM NameOffset [mm] VP1010.371 HP1010.008 HP1020.144 VP103-0.155 HP1040.023 HP1051.659 VP1060.177 HP107-0.621 VP1080.137 HP1091.626 VP110-0.249 VP1110.053 HP1121.301 VP1130.002 HP1140.323 HP1150.089 VP1160.008 HP1170.020 VP118-0.191 HP1190.021 HP1210.103 VP1210.025 HPTGT-0.054 VPTGT-0.084

9. What happened for most of Feb. Run? Physical and Electric offsets were in right, but electronic offsets were in with the wrong sign (added, not subtracted). So to get to the right position for up to 2PM Feb.22, have to subtract 2* electronic offset BPM Name Electronic Offset [mm] VP101-1.210 HP1010.290 HP1020.330 VP103-0.310 HP1040.290 HP105-1.520 VP106-0.550 HP1070.610 VP108-0.370 HP1090.080 VP110-0.370 VP1110.470 HP1120.560 VP1131.018 HP1140.485 HP1150.513 VP1160.610 HP1171.045 VP1180.288 HP1190.592 HP121-0.162 VP121-0.010 HPTGT0.571 VPTGT0.120 HPTGT correction: -1.4mm!

10. So what did the beam look like for stable running at that point? PM105 off by many wires! HTGT also off from 0 (from E-log, 20 Feb)

11. What happened when BPM entries were corrected (2/22, 13:00-14:00)? Autotune was run, which tries to set all bpm readbacks to 0. BUT can’t change position at injection, so not all BPM’s did read back 0. PM’s much closer to 0 than they were before, and also much closer to BPM’s than previously.